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Why does this defined QT_NO_DEBUG_OUTPUT not supress the qDebug?

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  • D DragonautX

    Oh, I was doing a Debug build. I switched to release build, cleaned, ran qmake, did a build, and did Ctrl+R to run, but the qDebug message is still showing in QtCreator's Application Output. Do you know anything else I can try?

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #4

    @DragonautX
    Ok that's odd.
    I use
    CONFIG(release, debug|release):DEFINES += QT_NO_DEBUG_OUTPUT

    Let me check if it still works :)

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    • D Offline
      D Offline
      DragonautX
      wrote on last edited by DragonautX
      #5

      Oh wait, it's my .pro file that's the problem. I added the line you said you used, cleaned, qmake, built, and ran, and it worked. I didn't know you were supposed to add that line to your .pro. I thought a #define would work just fine by itself?

      QT += widgets
      
      SOURCES += \
          main.cpp
      
      CONFIG(release, debug|release):DEFINES += QT_NO_DEBUG_OUTPUT
      
      mrjjM 2 Replies Last reply
      0
      • D DragonautX

        Oh wait, it's my .pro file that's the problem. I added the line you said you used, cleaned, qmake, built, and ran, and it worked. I didn't know you were supposed to add that line to your .pro. I thought a #define would work just fine by itself?

        QT += widgets
        
        SOURCES += \
            main.cpp
        
        CONFIG(release, debug|release):DEFINES += QT_NO_DEBUG_OUTPUT
        
        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #6

        @DragonautX
        seems fine. make sure to really clean build folder.

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        • D DragonautX

          Oh wait, it's my .pro file that's the problem. I added the line you said you used, cleaned, qmake, built, and ran, and it worked. I didn't know you were supposed to add that line to your .pro. I thought a #define would work just fine by itself?

          QT += widgets
          
          SOURCES += \
              main.cpp
          
          CONFIG(release, debug|release):DEFINES += QT_NO_DEBUG_OUTPUT
          
          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by mrjj
          #7

          @DragonautX
          Just tested in this sample
          https://www.dropbox.com/s/oaf75jo0awpm1fc/mydebug.zip?dl=0
          Works here in Qt5.7 win 10.

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          • D Offline
            D Offline
            DragonautX
            wrote on last edited by
            #8

            Ya, it worked. I guess I was clicking too fast and forgot to really clean. It works for both the #define preprocessor and the .pro code. Anyways, thanks for the help and uploading an example too. That was helpful. I'll make sure to check next time if I'm Debug or Release mode.

            mrjjM 1 Reply Last reply
            1
            • D DragonautX

              Ya, it worked. I guess I was clicking too fast and forgot to really clean. It works for both the #define preprocessor and the .pro code. Anyways, thanks for the help and uploading an example too. That was helpful. I'll make sure to check next time if I'm Debug or Release mode.

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #9

              @DragonautX
              Super
              As last note:
              I find this pretty nice

              qDebug()<<__FILE__<<__LINE__<<__PRETTY_FUNCTION__;
              
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              • D Offline
                D Offline
                DragonautX
                wrote on last edited by
                #10

                That's pretty cool. Didn't know predefined macros like that were there before. wasn't able to use __PRETTY_FUNCTION__, but __FUNCTION__ worked. From SO, seems like __PRETTY_FUNCTION__ is only for some gcc compiler, and Qt says I'm using mvsc. Is it supposed to work with mvsc too? That's how all my test projects have been compiled on so far by Qt.

                mrjjM 1 Reply Last reply
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                • D DragonautX

                  That's pretty cool. Didn't know predefined macros like that were there before. wasn't able to use __PRETTY_FUNCTION__, but __FUNCTION__ worked. From SO, seems like __PRETTY_FUNCTION__ is only for some gcc compiler, and Qt says I'm using mvsc. Is it supposed to work with mvsc too? That's how all my test projects have been compiled on so far by Qt.

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by mrjj
                  #11

                  @DragonautX said in Why does this defined QT_NO_DEBUG_OUTPUT not supress the qDebug?:

                  PRETTY_FUNCTION

                  oh yes, sorry, its gcc
                  I think Vs have

                  __FUNCDNAME__; // Decorated
                  __FUNCSIG__; // Signature
                  and 
                  __FUNCTION__; //should be same
                  
                  

                  Didnt test lately, but it does have something the same.

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                  • D Offline
                    D Offline
                    DragonautX
                    wrote on last edited by
                    #12

                    Alright, cool. Thanks for the tip!

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                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #13

                      Hi,

                      Otherwise you can use Q_FUNC_INFO. Shorter to write :)

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
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